Perceived Risk of Predation Affects Reproductive Life-History Traits in Gambusia holbrooki, but Not in Heterandria formosa

Perceived Risk of Predation Affects Reproductive Life-History Traits in Gambusia holbrooki, but Not in Heterandria formosa

Key to predicting impacts of predation is understanding the mechanisms through which predators impact prey populations. While consumptive effects are well-known, non-consumptive predator effects (risk effects) are increasingly being recognized as important. Studies of risk effects, however, have focused largely on how trade-offs between food and safety affect fitness. Less documented, and appre...

securitization of mortality risks in life annuities

insurers have in the past few decades faced longevity risks - the risk that annuitants survive more than expected - and therefore need a new approach to manage this new risk. in this dissertation we survey methods that hedge longevity risks. these methods use securitization to manage risk, so using modern financial and insurance pricing models, especially wang transform and actuarial concepts, ...

Reproductive state affects hiding behaviour under risk of predation but not exploratory activity of female Spanish terrapins.

Female investment during reproduction may reduce survivorship due to increased predation risk. During pregnancy, the locomotor performance of gravid females might be diminished due to the additional weight acquired. In addition, egg production may also increase thermoregulatory, metabolic and physiological costs. Also, pregnant females have greater potential fitness and should take fewer risks....

Predation, food limitation, phenotypic plasticity and life-history variation in Gambusia hubbsi.

Langerhans et al. (2007) present molecular data, morphological variation of both males and females, and female mate preferences as evidence that ecological speciation, mediated by differences in exposure to predation by piscivores (Gobiomorus dormitor as well other piscivorous fish), occurred among populations of Gambusia hubbsi occupying blue holes on Andros, Commonwealth of the Bahamas. Their...

Predation Risk and Behavioral Life History